This unusual costume is so all encompassing it has sleeves for the horse's legs! You can see the attachments that hold the costume on the inside of the far leg and under the neck. Notice some of the details: pompoms every few inches on the reins, the decorative border on the saddle, and the applique shapes sewn onto the red background of the costume.
According to the photographer's caption, the photo was taken in Malaysia, at a festival of the Bajau people.
Photo: Kervinchong on flickr.